A three-year study of controls on methane emissions from two Michigan peatlands

Robert David Shannon, Jeffrey R. White

Research output: Contribution to journalArticle

157 Citations (Scopus)

Abstract

We investigate temporal changes in methane emissions over a three-year period from two peatlands in Michigan. Mean daily fluxes ranged from 0.6-68.4 mg CH4 m-2d-1 in plant communities dominated by Chamaedaphne calyculata, an eficaceous shrub, to 11.5-209 mg CH4 m-2d-1 in areas dominated by plants with aerenchymatous tissues, such as Carex oligosperma and Scheuchzeria palustris. Correlations between methane flux and water table position were significant at all sites for one annual cycle when water table fluctuations ranged from 15 cm above to 50 cm below the peat surface. Correlations were not significant during the second and third annual periods with smaller water table fluctuations. Methane flux was strongly correlated with peat temperatures at -5 to -40 cm (rs = 0.82 to 0.98) for all three years at sites with flora acting as conduits for methane transport. At shrub sites, the correlations between methane flux and peat temperature were weak to not significant during the first two years, but were strong in the third year. Low rates of methane consumption (-0.2 to -1.5 mg CH4 m-2 d-1 ) were observed at shrub sites when the water table was below -20 cm, while sites with plants capable of methane transport always had positive net fluxes of methane. The methane oxidizing potential at both types of sites was confirmed by peat core experiments. The results of this study indicate that methane emissions occur at rates that cannot be explained by diffusion alone; plant communities play a significant role in altering methane flux from peatland ecosystems by directly transporting methane from anaerobic peat to the atmosphere.

Original languageEnglish (US)
Pages (from-to)35-60
Number of pages26
JournalBiogeochemistry
Volume27
Issue number1
DOIs
StatePublished - Jan 1 1994

Fingerprint

Methane
peatland
methane
Peat
peat
Fluxes
water table
shrub
Water
plant community
annual cycle
Ecosystems
flora
temperature
Tissue

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Water Science and Technology
  • Earth-Surface Processes

Cite this

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abstract = "We investigate temporal changes in methane emissions over a three-year period from two peatlands in Michigan. Mean daily fluxes ranged from 0.6-68.4 mg CH4 m-2d-1 in plant communities dominated by Chamaedaphne calyculata, an eficaceous shrub, to 11.5-209 mg CH4 m-2d-1 in areas dominated by plants with aerenchymatous tissues, such as Carex oligosperma and Scheuchzeria palustris. Correlations between methane flux and water table position were significant at all sites for one annual cycle when water table fluctuations ranged from 15 cm above to 50 cm below the peat surface. Correlations were not significant during the second and third annual periods with smaller water table fluctuations. Methane flux was strongly correlated with peat temperatures at -5 to -40 cm (rs = 0.82 to 0.98) for all three years at sites with flora acting as conduits for methane transport. At shrub sites, the correlations between methane flux and peat temperature were weak to not significant during the first two years, but were strong in the third year. Low rates of methane consumption (-0.2 to -1.5 mg CH4 m-2 d-1 ) were observed at shrub sites when the water table was below -20 cm, while sites with plants capable of methane transport always had positive net fluxes of methane. The methane oxidizing potential at both types of sites was confirmed by peat core experiments. The results of this study indicate that methane emissions occur at rates that cannot be explained by diffusion alone; plant communities play a significant role in altering methane flux from peatland ecosystems by directly transporting methane from anaerobic peat to the atmosphere.",
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A three-year study of controls on methane emissions from two Michigan peatlands. / Shannon, Robert David; White, Jeffrey R.

In: Biogeochemistry, Vol. 27, No. 1, 01.01.1994, p. 35-60.

Research output: Contribution to journalArticle

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